According to the BradBlog:
An explosion has occurred within the past hour at the Fukushima Daiichi Unit 3 nuclear reactor in Japan. It appears to by a hydrogen explosion similar to the one which occurred at Unit 1 on Saturday. There had been reports earlier in the day that radiation had been rising at the reactor, similar to what had been reported before the earlier explosion at Unit 1.More from Brad Friedman

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One of the TV talking heads said that the explosion in the first reactor actually spread the exposed fuel rods around. This kept them from being a single super hot unstoppable blob of atomic fire. No real details on this second explosion yet.

BBC News:Meltdown Alert at ReactorThe latest hydrogen blast was felt 40km (25 miles) away and sent a huge column of smoke into the air. Nearly 185,000 people have been evacuated from a 20km (12 mile) exclusion zone around the plant. The US said it had moved one of its aircraft carriers from the area after detecting low-level radiation 160km (100 miles) offshore.

New York Times:More bad news.Crews prepared Monday to pump seawater into a third reactor in order to prevent a meltdown of its fuel. Experts called the injection of seawater into the site's three crippled reactors units a desperation move never attempted before in the industry describing this as a Hail Mary Pass.

Christian Science Monitor:"Oil Prices, World Markets AffectedThe natural disaster in Japan has put an end to the recent rise in the price of oil. Crude oil tumbled over $4 to below $100 per barrel as Japanese refiners shut plants. This drop was dramatic, and looks like some traders took advantage of the natural disaster to go ahead and take profits on the higher oil prices.

"Now there have been catastrophic events at three corners of the Pacific Plate—one in the northwest, on Friday; one in the southwest, last month; one in the southeast, last year. That leaves just one corner unaffected—the northeast. And the fault line in the northeast of the Pacific Plate is the San Andreas Fault, underpinning the city of San Francisco."

Current reports indicate 500,000 individuals evacuated from tsunami, quake, and nuclear areas. Japan's Nikkei stock index closed down 6.18%, the worst drop in two years.